Practice Questions
Work out the input to these two function machines, then click
to see whether you are correct.

?

÷ 3

3

?

+ 2

× 5

25

&nbsp

Exercises

Work out the answers to the questions below and fill in the boxes. Click on the
button to find out whether you have answered correctly. If you are right
then will appear and you should move on to the next
question. If appears then your answer is wrong. Click
on to clear your original answer and have another go.
If you can't work out the right answer then click on
to see
the answer.

Question 1
Fill in the output on each of these function machines.

(a)

4

+ 6

(b)

3

× 10

(c)

10

- 7

(d)

14

÷ 2

(e)

21

÷ 3

(f)

100

× 5

Question 2
Fill in the input on each of these function machines.

(a)

× 5

30

(b)

+ 8

12

(c)

- 9

11

(d)

÷ 4

5

(e)

+ 12

21

(f)

× 7

42

Question 3
Fill in the output on each of these double function machines.

(a)

3

× 4

- 7

(b)

10

- 8

× 7

(c)

8

- 5

× 5

(d)

-2

× 6

+ 20

(e)

7

+ 2

÷ 3

(f)

-5

+ 8

× 9

Question 4
Fill in the input on each of these double function machines.

(a)

+ 1

× 4

12

(b)

+ 7

÷ 6

4

(c)

× 4

+ 9

37

(d)

× 9

- 20

34

(e)

÷ 6

- 1

7

(f)

- 6

÷ 7

9

(g)

+ 8

× 4

24

(h)

× 2

+ 7

- 3

Question 5
Here is a triple function machine:

Input

× 7

- 5

÷ 2

Output

(a) What is the output if the input is 8?

(b) What is the input if the output is 22?

(c) What is the input if the output is -13?

Question 6
A number is multiplied by 10, and then 6 is added to get 36.What was the number?

Question 7
Karen asks her teacher, Miss Sharp, how old she is.
Miss Sharp replies that if you double her age, add 7 and then divide by 3, you get 21.How old is Miss Sharp?
years old

Question 8
Sally is given her pocket money. She puts half in the bank and then spends £3 in one shop and £2.50 in another shop.
She goes home with £1.25.How much pocket money was she given?
£

Question 9
A bus has its maximum number of passengers when it leaves the bus station.
At the first stop, half of the passengers get off. At the next stop 7 people get on and at the next stop 16 people get off.
There are now 17 people on the bus.How many passengers were on the bus when it left the bus station?
passengers

Question 10
Prakesh buys a tomato plant. In the first week it doubles its height.
In the second week it grows 8 cm. In the third week it grows 5 cm.What was the height of the plant when Prakesh bought it if it is now 35 cm in height?
cm

You have now completed Unit 16 Section 2

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